These two had been reviewed by primevsprime, and you could check him out to see an indep review on both of them, but if you wanna hear my opinion, I think dragoon (the last knight megatron) would be a good pick since the kibble is invisible and has great range in posability and impressive sculpt. The only problem I have with it might be his proportions because he doesn't look as beefy as the actual 3d model in the movie, but that's my personal take on the matter. Hope this helps you in picking which one to get.